# Enter your code here. Read input from STDIN. Print output to STDOUT
import math

n = int(raw_input().strip())
steps = str(raw_input().strip())

elevation = 0
valleys = 0
for step in steps:
    if elevation == 0 and step == 'D':
        valleys += 0.5
    if step == 'D':
        elevation -= 1
    elif step == 'U':
        elevation += 1
    if elevation == 0 and step == 'U':
        valleys += 0.5

print int(math.floor(valleys))